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The other day I had a little "event" with my tube amp. As I powered it on, there was a "thump" from the speakers, and the right channel fuse blew.
Hmmm... ok these tubes are a little old, let's put in a fresh set. Turn down the bias first... Ok all set... Turn it on, and "thump", the fuse blows again... but now there's a little lightning storm going on inside of one of the power tubes. Turn the amp off, watch the storm slowly subside...
Clearly, something *other* than a bad tube happened. The amp is off to the manufacturer for diagnosis and repair. My questions...
(1) Could the arcing that happened inside of the tube have damaged it? Do I replace it on a "better safe than sorry" basis?
(2) I assume that this was a cap and/or resistor failure... the amp is about 12 years old, is it time to consider a full refurb as preventive maintenance?
Opinions?
Cerebrate!
Follow Ups:
"Could the arcing that happened inside of the tube have damaged it?"
I'd be surprised if the tube was NOT damaged. Time to replace.
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Buy Chinese. Bury freedom.
This very well could be a failed coupling cap. Some of the most frequently asked for "audiophile" coupling capacitors are some of the least reliable. If it is a coupling cap, have the manufacturer replace them all (with their recommendation for reliability).
For what it's worth, a metalized polypropylene coupling cap should outlive most humans on the planet.
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